Moles larger than 6 mm in diameter, with an irregular border, which are asymmetrical, and changing should be checked. Comparison photos are available on aad.Org website.
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It means you go see Dr. Westfried(or your local equivalent) and have it looked at! Tell tale signs of problem lesions are usually a new itch, if a lesion bleeds, or gets multiple colors. If a lesion grows outward from the body(exophytic) it is usually benign.

Have it checked. The ABCDE'S that are used to alert us that a mole might we worrisome are helpful in identifying early moles (nevi) that may be transforming. If the mole became darker but uniformly it is less worrisome that if parts of it changed.

See a board certified dermatologist and get it looked at. Most moles evolve (in color and size) and this can occur during puberty, pregnancy or other conditions where there is hormone changes. However, some people are at a higher risk (skin color, history of sunburns, family history of melanoma, dysplastic nevus syndrome). Go to website www.Skincancer.Org.

In brief:
Have it checked!

If you are worried have it checked.

See a board certified dermatologist and get it looked at. Most moles evolve (in color and size) and this can occur during puberty, pregnancy or other conditions where there is hormone changes. However, some people are at a higher risk (skin color, history of sunburns, family history of melanoma, dysplastic nevus syndrome). Go to website www.Skincancer.Org.
Would you like to video or text chat with me?